package com.erms.dao;

import java.util.List;
import org.hibernate.LockMode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.erms.bean.Course;

/**
 * A data access object (DAO) providing persistence and search support for
 * Course entities.
 * Transaction control of the save(), update() and delete() operations
 * can directly support Spring container-managed transactions or they can be
 * augmented to handle user-managed Spring transactions.
 * Each of these methods provides additional information for how to configure it
 * for the desired type of transaction control.
 * 
 * @see com.erms.bean.Course
 * @author MyEclipse Persistence Tools
 */
public class CourseDAO extends HibernateDaoSupport {
	private static final Logger	log				= LoggerFactory
														.getLogger(CourseDAO.class);
	// property constants
	public static final String	NAME			= "name";
	public static final String	GRADE			= "grade";
	public static final String	INTRODUCTION	= "introduction";

	protected void initDao() {

		// do nothing
	}

	public void save(Course transientInstance) {

		log.debug("saving Course instance");
		try {
			getHibernateTemplate().save(transientInstance);
			log.debug("save successful");
		} catch (RuntimeException re) {
			log.error("save failed", re);
			throw re;
		}
	}

	public void delete(Course persistentInstance) {

		log.debug("deleting Course instance");
		try {
			getHibernateTemplate().delete(persistentInstance);
			log.debug("delete successful");
		} catch (RuntimeException re) {
			log.error("delete failed", re);
			throw re;
		}
	}

	public Course findById(java.lang.String id) {

		log.debug("getting Course instance with id: " + id);
		try {
			Course instance = (Course) getHibernateTemplate().get(
					"com.erms.bean.Course", id);
			return instance;
		} catch (RuntimeException re) {
			log.error("get failed", re);
			throw re;
		}
	}

	public List findByExample(Course instance) {

		log.debug("finding Course instance by example");
		try {
			List results = getHibernateTemplate().findByExample(instance);
			log.debug("find by example successful, result size: "
					+ results.size());
			return results;
		} catch (RuntimeException re) {
			log.error("find by example failed", re);
			throw re;
		}
	}

	public List findByProperty(String propertyName, Object value) {

		log.debug("finding Course instance with property: " + propertyName
				+ ", value: " + value);
		try {
			String queryString = "from Course as model where model."
					+ propertyName + "= ?";
			return getHibernateTemplate().find(queryString, value);
		} catch (RuntimeException re) {
			log.error("find by property name failed", re);
			throw re;
		}
	}

	public List findByName(Object name) {

		return findByProperty(NAME, name);
	}

	public List findByGrade(Object grade) {

		return findByProperty(GRADE, grade);
	}

	public List findByIntroduction(Object introduction) {

		return findByProperty(INTRODUCTION, introduction);
	}

	public List findAll() {

		log.debug("finding all Course instances");
		try {
			String queryString = "from Course";
			return getHibernateTemplate().find(queryString);
		} catch (RuntimeException re) {
			log.error("find all failed", re);
			throw re;
		}
	}

	public Course merge(Course detachedInstance) {

		log.debug("merging Course instance");
		try {
			Course result = (Course) getHibernateTemplate().merge(
					detachedInstance);
			log.debug("merge successful");
			return result;
		} catch (RuntimeException re) {
			log.error("merge failed", re);
			throw re;
		}
	}

	public void attachDirty(Course instance) {

		log.debug("attaching dirty Course instance");
		try {
			getHibernateTemplate().saveOrUpdate(instance);
			log.debug("attach successful");
		} catch (RuntimeException re) {
			log.error("attach failed", re);
			throw re;
		}
	}

	public void attachClean(Course instance) {

		log.debug("attaching clean Course instance");
		try {
			getHibernateTemplate().lock(instance, LockMode.NONE);
			log.debug("attach successful");
		} catch (RuntimeException re) {
			log.error("attach failed", re);
			throw re;
		}
	}

	public static CourseDAO getFromApplicationContext(ApplicationContext ctx) {

		return (CourseDAO) ctx.getBean("CourseDAO");
	}
}
